ML19273B567

LER 79-024/03L-0 on 790214:while Performing Startup Test Procedure HNP-2-10925,safety Relief Valves C & G Failed to Open.Cause Unknown.Topworks Have Been Replaced & Followup Rept Will Be Written When Investigation Is Complete

ML19273B567
Person / Time
Site:	Hatch
Issue date:	02/28/1979
From:	Thomas Greene GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19273B566	List: ML19273B565 ML19273B567
References
LER-79-024-03L, LER-79-24-3L, NUDOCS 7904090177
Download: ML19273B567 (1)

Text

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DATE 74 7b RE PORT D AT E 80 7 60 61 DOCKET NUMBER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h o 2 l At 2148 CST 2/14/79 while perfonning startup test procedure HNP-2-10925, MSIV clos- l 1 o 13 l l ure, safety relief valves 2B21-F013 C and G failed to open with its 1090 Psig set- I o 4 l points in the presence of a reactor high pressure of 1125 Psig. Safety relief valvej lo Isl 1 C and G were declared inoperable and a maintenance request was initiated to replace ;

C and G with new topworks of the same pressure setpoints. The other 9 safety reliefg lo lc l o 7 valves were available at the time of the scram. This is a non-repetitive occurrence l 1

oi 3 l for Unit 2, but this event has repetitively occurred on Unit 1. l

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43 A4 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l The cause for the apparent failure of the tarcet rock Mod 4 7567F. 6 x 10 two stage I The top- I i i i relief valves 2B21- F013 C (Serial #308) and G (Serial #310) is unknown.

l i i 21 I works have been replaced. A followup report will be written when the investigation i 3 l 1s completed on the removed topworks. l I

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